/*
    Copyright 2007-2008 Christian Henning, Andreas Pokorny, Lubomir Bourdev
    Use, modification and distribution are subject to the Boost Software License,
    Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
    http://www.boost.org/LICENSE_1_0.txt).
*/

/*************************************************************************************************/

#ifndef BOOST_GIL_EXTENSION_IO_JPEG_SUPPORTED_TYPES_HPP
#define BOOST_GIL_EXTENSION_IO_JPEG_SUPPORTED_TYPES_HPP

////////////////////////////////////////////////////////////////////////////////////////
/// \file
/// \brief
/// \author Christian Henning, Andreas Pokorny, Lubomir Bourdev \n
///
/// \date   2007-2008 \n
///
////////////////////////////////////////////////////////////////////////////////////////

#include <boost/mpl/not.hpp>
#include <boost/type_traits/is_same.hpp>

#include <boost/gil/channel.hpp>
#include <boost/gil/color_base.hpp>

namespace boost
{
namespace gil
{
namespace detail
{

// Read support

template< jpeg_color_space::type ColorSpace >
struct jpeg_rw_support_base
{
    static const jpeg_color_space::type _color_space = ColorSpace;
};

template< typename Channel
, typename ColorSpace
>
struct jpeg_read_support : read_support_false
            , jpeg_rw_support_base< JCS_UNKNOWN > {};

template<>
struct jpeg_read_support< bits8
            , rgb_t
            > : read_support_true
            , jpeg_rw_support_base< JCS_RGB > {};

template<>
struct jpeg_read_support< bits8
            , cmyk_t
            > : read_support_true
            , jpeg_rw_support_base< JCS_CMYK > {};

template<>
struct jpeg_read_support< bits8
            , gray_t
            > : read_support_true
            , jpeg_rw_support_base< JCS_GRAYSCALE > {};

// Write support

template< typename Channel
, typename ColorSpace
>
struct jpeg_write_support : write_support_false
            , jpeg_rw_support_base< JCS_UNKNOWN > {};

template<>
struct jpeg_write_support< bits8
            , gray_t
            > : write_support_true
            , jpeg_rw_support_base< JCS_GRAYSCALE > {};

template<>
struct jpeg_write_support< bits8
            , rgb_t
            > : write_support_true
            , jpeg_rw_support_base< JCS_RGB > {};

template<>
struct jpeg_write_support< bits8
            , cmyk_t
            > : write_support_true
            , jpeg_rw_support_base< JCS_CMYK > {};

} // namespace detail

template< typename Pixel >
struct is_read_supported< Pixel
            , jpeg_tag
            >
            : mpl::bool_< detail::jpeg_read_support< typename channel_type< Pixel >::type
            , typename color_space_type< Pixel >::type
            >::is_supported
            >
{
    typedef detail::jpeg_read_support< typename channel_type< Pixel >::type
    , typename color_space_type< Pixel >::type
    > parent_t;

    static const typename jpeg_color_space::type _color_space = parent_t::_color_space;
};

template< typename Pixel >
struct is_write_supported< Pixel
            , jpeg_tag
            >
            : mpl::bool_< detail::jpeg_write_support< typename channel_type< Pixel >::type
            , typename color_space_type< Pixel >::type
            >::is_supported
            >
    {};


} // namespace gil
} // namespace boost


#endif // BOOST_GIL_EXTENSION_IO_JPEG_SUPPORTED_TYPES_HPP
